In this part of the lab, experiments will be performed that illustrate Le Châtel

Question

In this part of the lab, experiments will be performed that illustrate Le Châteliers Principle 1. Obtain 6 mL of CoCl2 which may be represented by the following equilibrium: red blue 2 To 2 mL of CoCl2 add 1 scoop NaCI and shake thoroughly to dissolve it. ult (did the solution become redder or bluer?) Blver Explain the result in terms of Le Châtelier's Principle To 2 mL of CoClh add 5 mL deionized water. Result (redder or bluer?y Redde Explain the result in terms of Le Châteliers Principle 4. Heat the remaining 2 mL of CoCl2 until liquid is boiling. Result (redder or bluer?) Blver Explain the result in terms of Le Châteliers Principle

Explanation / Answer

(a)

Addition of NaCl increases the concentration of CL- ions and thus the concentration of reactants, hence according to Le-chatlier's principle the equilibrium is shifted towards right side. So, more and more amount of products can be formed. SO, it becomes bluer.

(b)

As water is pure liquid, addtion of pure liquids or pure solids does not alter the concentration fo that substance. Hence addtion of water does not alter the equilbrium position.

So, no chang ein colour.

(c)

According to Le-chatlier's principle increase in temperature ( heating) shifts equilibrium towards endothermic side.

Since the forward reaction is endothermic nature, heating the system shifts the equilibrium towards right side.

Henc, it becomes bluer.

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